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The ecological pyramid illustrated below shows the transfer of energy through trophic levels:

"Ecological Pyramid." Wikipedia. Wikimedia Foundation, 01 June 2015. Web. 18 Apr. 2016.

Which of the following statements BEST describes differences in free energy availability between organisms at different trophic levels?


There is no trophic level after apex predators because there is no more free energy available to sustain anything.


Primary producers use the most free energy, which limits what is available to all the remaining trophic levels.


Free energy is conserved in food chains and webs, as the first law of thermodynamics mandates.


Free energy is recycled in ecological pyramids via decomposers.

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